Re: 2.6.24-rc4-git5: Reported regressions from 2.6.23

Ingo Molnar
2007-12-08T08:28:49Z

* Fabio Comolli <fabio.comolli@gmail.com> wrote:

> <snip>
>
> > Subject : Battery shows up twice in kpowersave
> > Submitter : Rolf Eike Beer <eike-kernel@sf-tec.de>
> > References : http://bugzilla.kernel.org/show_bug.cgi?id=9494
> > Handled-By : Alexey Starikovskiy <astarikovskiy@suse.de>
> > Patch :
> >
>
> I don't think that this is a regression: I reported on RedHat bugzilla
> when I switched from F7 to F8 and I was using 2.6.23.8 at that time.
> It looks to me an HAL regression, but of course I may be wrong :-) as
> the reported bisected to a bad commit.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=373041
>
> By the way, I now switched to Fedrora Rawhide with a 2.6.24-rc4-git5
> custom kernel and Gnome desktop and the problem is still present, even
> with gnome-power-manager.

to me this looks like an ABI regression - utilities should work without
change. Something changed in /sys output that caused HAL to think that
there are two batteries:

| The output of lshal shows that there are two UDI's with
| info.capabilities = { 'battery' }:
|
| udi = '/org/freedesktop/Hal/devices/acpi_BAT0'
| udi = '/org/freedesktop/Hal/devices/computer_power_supply_0'

whether it's a HAL bug or a kernel bug, the original state should be
restored and it should be worked out without breaking users of older HAL
versions.

grumble: way too many times do various system utilities break when i
upgrade the kernel on my laptop. Maybe a new debug mechanism: we should
start fingerprinting the exact /sys and /proc output and enforce that
it's immutable across kernel releases as long as the hardware is
unmodified?

Ingo